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**1. The probability density function for the continuous random vector X = (X**

Fx

0 otherwise }

Calculate the probability that X

_{1}, X_{2}) is given by:Fx

_{1}, x_{2}(X_{1,X2}) = { 1/2 if X_{1}+X_{2}[tex]\leq[/tex] 2,X_{1}[tex]\geq[/tex] 0,X_{2}[tex]\geq[/tex]00 otherwise }

Calculate the probability that X

_{1}>2X_{2}I do not know which formular to use. I can't find the right one. How do I do this? The joint density formular?